choi san has been changing identities and going undercover as a vampire for quite long now. in order not to get bored he goes from one uni to another, studying the degrees he's curious about, as he has pretty much nothing else to focus on in his immortal life. this year he has opted for a master in microbiology, but what he doesn't expect it's to have to deal with such a curious person since day one that comes to be jung wooyoung. would this make the reluctant to socialise choi san to open up to someone back again? or would it end on tragedy, like the other bonds the bloodsucker had created with humans ended?